aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.4.3/libjava/classpath/gnu/java/beans/encoder/ClassPersistenceDelegate.java
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/beans/encoder/ClassPersistenceDelegate.java')
-rw-r--r--gcc-4.4.3/libjava/classpath/gnu/java/beans/encoder/ClassPersistenceDelegate.java80
1 files changed, 80 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/beans/encoder/ClassPersistenceDelegate.java b/gcc-4.4.3/libjava/classpath/gnu/java/beans/encoder/ClassPersistenceDelegate.java
new file mode 100644
index 000000000..7b0656a5d
--- /dev/null
+++ b/gcc-4.4.3/libjava/classpath/gnu/java/beans/encoder/ClassPersistenceDelegate.java
@@ -0,0 +1,80 @@
+/* ClassPersistenceDelegate.java - A PersistenceDelegate for the Class type.
+ Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.beans.encoder;
+
+import java.beans.Encoder;
+import java.beans.Expression;
+import java.beans.PersistenceDelegate;
+
+/** <p>The <code>ClassPersistenceDelegate</code> creates
+ * <code>Expression</code> instances which denote class resolutions.</p>
+ *
+ * <p>The class resolution is always the last step when serializing a tree
+ * of objects. Due to the recursive nature of the algorithm we need a way
+ * to end the recursion. This is achieved by the implementation of this
+ * {@link instantiate} method. Arbitrary classes are described with a call
+ * to <code>Class.forName</code>. However for the <code>Class</code> class
+ * we call <code>getClass()</code> on a <code>String.class</code> instance.
+ * This in turn lead to the resolution of the String class which is always
+ * encoded as <code>"".getClass()</code>. Finally the <code>Encoder</code>
+ * treats strings in a special way so that the recursion ends here.
+ *
+ * @author Robert Schuster (robertschuster@fsfe.org)
+ */
+public class ClassPersistenceDelegate extends PersistenceDelegate
+{
+
+ protected Expression instantiate(Object oldInstance, Encoder out)
+ {
+ Class oldClass = (Class) oldInstance;
+
+ // Due to the special handling of String instances in the Encoder
+ // this Expression does not lead to further class resolutions.
+ if (oldClass == String.class)
+ return new Expression(oldClass, "", "getClass", null);
+
+ // This Expression will lead to the class resolution of String.class.
+ if (oldClass == Class.class)
+ return new Expression(oldClass, String.class, "getClass", null);
+
+ // This Expression will lead to the class resolution of Class.class.
+ return new Expression(oldClass, Class.class, "forName",
+ new Object[] { oldClass.getName() });
+ }
+
+}